1. Taras Shevchenko National university of Kyiv, 64/13 Volodymyrska Str., 01601 Kyiv, Ukraine,
2. Laboratory for Surface Science and Coating Technologies, Empa − Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Dübendorf, Switzerland
3. Taras Shevchenko National university of Kyiv, 64/13 Volodymyrska Str., 01601 Kyiv, Ukraine
4. V. N. Bakul Institute for Superhard Materials of NAS of Ukraine, 2, Avtozavodska Street, 04074 Kyiv, Ukraine