1. Institute of Electron Technology, Al. Lotników 32/46, 02-668 Warszawa, Poland
2. European Synchrotron Radiation Facility, BP 220, 38043 Grenoble, France
3. Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland
4. Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warszawa, Poland