Affiliation: | 1. Department of Physics, University of Fribourg, CH-1700 Fribourg, Switzerland;2. Institute of Physics, Jan Kochanowski University, 25-406 Kielce, Poland;3. J. Stefan Institute, SI-1000, Ljubljana, Slovenia;4. European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble, France |