1. IOM-CNR; s.s. 14, Km. 163.5 in AREA Science Park 34149 Basovizza Trieste Italy
2. Solid State Physics Division; Ioffe Physical-Technical Institute of Russian Academy of Sciences; 26 Polytechnicheskaya str. 194021 St. Petersburg Russia
3. CNR-SPIN UOS Salerno; Via Giovanni Paolo II 132 84084 Fisciano Italy
4. ISMN-CNR; Via Gobetti 101 40129 Bologna Italy
5. Synchrotron SOLEIL; L'Orme des Merisiers; Saint-Aubin, BP 48 F-91192 Gif-sur-Yvette Cedex France
6. Sorbonne Universités; UPMC Université Paris 06; CNRS; UMR 7614 Paris France
7. Laboratoire de Chimie Physique-Matière et Rayonnement; F-75005 Paris France
8. Dipartimento di Ingegneria E. Ferrari; Università di Modena e Reggio Emilia; Via Vivarelli 10 41125 Modena Italy
9. Department of Physics; University of Johannesburg; PO Box 524 Auckland Park 2006 South Africa