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. V. N. Bakul Institute for Superhard Materials of NAS of Ukraine, 2, Avtozavodska Street, 04074 Kyiv, Ukraine