[1] Univ Belgrade, Inst Phys, Belgrade 11080, Serbia
[2] Univ Leeds, Sch Elect & Elect Engn, Leeds LS2 9JT, W Yorkshire, England
[3] Masaryk Univ, Dept Condensed Matter Phys, Fac Sci, CZ-61137 Brno, Czech Republic
[4] Univ Bari, Inst Inorgan Methodol & Plasmas, IMIP CNR, Dept Chem, I-70126 Bari, Italy
[5] Profactor GmbH, Funct Surfaces & Nanostruct, A-4407 Steyr Gleink, Austria
[6] Johannes Kepler Univ Linz, Ctr Surface & Nanoanalyt, A-4040 Linz, Austria