1. Institute of Atomic Energy POLATOM, 05-400 Otwock-Świerk, Poland
2. Institute of Electronic Materials Technology, Wólczyńska 133, 01-919 Warsaw, Poland
3. Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
4. HASYLAB at DESY, Notkestr. 85, 22-603 Hamburg, Germany