1. Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava 845 11, Slovakia
2. Center for Advanced Materials Application, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava 845 11, Slovakia
3. Institute of Electrical Engineering, Slovak Academy of Sciences, Dúbravská cesta 9, Bratislava 845 11, Slovakia
4. Laboratory of Thin Films, Institute of Physics, ASCR, Cukrovarnická 10, Prague 162 00, Czech Republic
5. Elettra-Sincrotrone Trieste S. C.p.A, Basovizza, Trieste 34149, Italy
6. Department of Materials Science, Montanuniversität Leoben, Leoben A-8700, Austria
7. Institute of Applied Physics, University of Tübingen, Tübingen 72076, Germany