1. Institute of Electronic Materials Technology; Wólczyńska 133 01-919 Warsaw Poland
2. National Centre for Nuclear Research; Soltana 7 05-400 Otwock Poland
3. Institute of Experimental Physics; University of Warsaw; Pasteura 5 02-093 Warsaw Poland
4. HASYLAB at DESY; Notkestr. 85 22603 Hamburg Germany