Who were Haroot and Maroot? Angels! No

And started pursuing what the evil ones had spread in the kingdom of Sulie'maan. {Ill doings of evil mongers do not implicate the Ruler therefore} It was not Sulie'maan who denied [to abhor magic tricks in line with teaching of Musa] but it were the evil-ones {in his kingdom} who denied and in addition to telling magic/illusionary trickstold people such things as someone had transpired to the Malakain [two men of position] Ha'root and Ma'root at Babylon. And Ha'root and Ma'root used not to teach these to anyone without both telling him; "We are the skilled/specialists; so you do not deny [it's possibility]" For reason, people learned from them the techniques to sow discord between husband and wife though they could not thus harm anyone except if Allah's permission was also there. And they learned what harmed them, not what profited them. And they knew that the one would have no share in the happiness of the Hereafter who made it a profession/business activity. And vile was the price for which they did sell their souls, if they but knew! [2:102]

Who were هَارُوتَ وَمَارُوتَ Haroot and Maroot?
Were they two angels or two men of authority

Grand Qur'an, while giving an account of the psyche and conduct of Bani Israel in time and space, has disclosed that:
وَاتَّبَعُواْ مَا تَتْلُواْ الشَّيَاطِينُ عَلَى مُلْكِ سُلَيْمَانَ
"And they started pursuing what the evil ones narrated in the kingdom of Suleiman".

This is the news regarding the physical conduct of some members of community, named Bani Israel; and what they followed/pursued in action was not something stated by pious men or angels but it were the assertions of Satan-natured people made in the kingdom of Suleiman.

وَمَا كَفَرَ سُلَيْمَانُ وَلَـكِنَّ الشَّيَاطِينَ كَفَرُواْ
{Ill doings of evil mongers do not implicate the Ruler therefore} It was not Suleiman who denied [to abhor magic in line with teaching of Musa] but it were the evil-ones {in his kingdom} who denied.

It is told that Suleiman had not refused/denied; refusal and denial is always about something believed/or asked. By giving this news it has been clarified that what someone attributes to Suleiman regarding his denial is factually incorrect. In fact it were evil mongers who had denied. What was that which they denied? Action/conduct of people reflects regarding what they accept and what they deny/refuse. What were Satan-natured people doing?

يُعَلِّمُونَ النَّاسَ السِّحْرَ وَمَا أُنزِلَ عَلَى الْمَلَكَيْنِ بِبَابِلَ هَارُوتَ وَمَارُوتَ
They were telling people the art of creating illusions [magic tricks] AND such things as someone had transpired [perhaps hypnosis] to الْمَلَكَيْنِ Harut and Marut at Babylon.

The word أُنزِلَ is الماضى المجهول, past, passive, singular masculine third person. "that what descended upon the two مَلَكَيْنِ " Its Root is ن ز ل and basic perception infolded is to descend from above. It is used to deliver to someone something from external source. Words derived from this Root have been used in the Grand Quran for 293 times and nowhere it is used with relation to descending something upon مَلَآئِكَةٌ . They themselves descend and are the carriers for descending things/messages/book upon others.

الْمَلَكَيْنِ Dual تثنية [Two] : معرفة with definite article ال. This word can be derived either from Arabic Root أ ل ك or م ل ك
The basic perception/meaning infolded in the Arabic Root أ ل ك is "chewed or champed-the process of biting, or grinding something vigorously, noisily, or the sound that this makes"; a message or communication sent from one person/party to another.
For conveying the message to someone the messenger needs to retrieve the message from memory. The message will come to the messenger's chest, the vocal cord will be vibrated creating/converting/translating the message into sound which will have to be articulated in the mouth with the help of two lips and tongue before the messenger could emit/throw [يَلْفِظُ ] from the mouth shaping it in the words of the language of person for whom the message was intended.

The statistics of words derived from this Root mentioned in the Grand Qur'an is as under:-
The word مَلَكٌ has appeared 6 times [6:08, 50; 11:12,31; 12:31; 25:07]
The word مَلَكًا has appeared 3 times [6:08, 09; 17:95]
The word مَّلَكُ has appeared once in [32:11]
The word مَالِكُ [with injector يَا} has appeared once [43:77} Only Angels are Guardians of Hell.
The word مَّلَكٍ has appeared once [53:26]
The word الْمَلَكُ has appeared twice [69:17; 89:22]
The word الْمَلاَئِكَةِ has appeared 25 times
The word الْمَلآئِكَةُ has appeared 33 times
The word الْمَلاَئِكَةَ has appeared 9 times[3:80;6:11;15:08;16:02; 25:22;37:150;39:75;43:19;53:27]
The word مَلَآئِكَةٌ has appeared twice [17:95; 66:06]
The word مَلَائِكَةً has appeared 4 times[23:24;41:14;43:60; 74:31]
الْمَلَكَيْنِ Dual تثنية [Two] has been used apart from for Haroot and Maroot it has only once been in the Grand Quran and that is with reference to the Root م ل ك.
َقَالَ مَا نَهَاكُمَا رَبُّكُمَا عَنْ هَـذِهِ الشَّجَرَةِ
Iblis said ; "Your Sustainer Lord has not restrained both you two from this particular female tree
إِلاَّ أَن تَكُونَا مَلَكَيْنِ
except for reason that you both might become two rulers
أَوْ تَكُونَا مِنَ الْخَالِدِينَ
or you both attain/become perpetual beings. {Refer 07:20]
It is a matter of common sense that telling a man, that restriction is imposed for fear of his becoming an angel, cannot create any sensation and fascination for a man who already knows that he is superior to angels since all the angels collectively have already bowed before him. Notwithstanding Iblis suffers from delusion of grandeur he is not such a fool to have suggested such non sensational thing for deception.

فَوَسْوَسَ إِلَيْهِ الشَّيْطَانُ قَالَ يَا آدَمُ هَلْ أَدُلُّكَ عَلَى شَجَرَةِ الْخُلْدِ وَمُلْكٍ لَّا يَبْلَى
"For deceiving, he fascinated him by saying, "O Adam, may I guide/lead/disclose you the tree of perpetual existence/permanence and مُلْكٍ the kingdom that never fades/weakens/decays? "

It is thus manifest that مَلَكَيْنِ is from the Root م ل ك meaning Ruler/prominent men of a territory/people.