1. Institute of Atomic Energy, 05-400 Otwock-Świerk, Poland
2. Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland
3. HASYLAB at DESY, Notkestraße 85, 22603 Hamburg, Germany
4. Institute of Electron Technology, al. Lotników 32/46, 02-668 Warsaw, Poland
5. Wrocław Technical University, Wyb. Wyspiańskiego 27, 53-370 Wrocław, Poland
6. Institute of Semiconductor Physics, RAS, Lavrentieva 13, 630090 Novosibirsk, Russia