1. Department of Chemical Engineering, Technion − Israel Institute of Technology, 3200003 Haifa, Israel
2. Deutsches Elektronen-Synchrotron − A Research Centre of the Helmholtz Association, Notkestrasse 85, D-22607 Hamburg, Germany
3. Institute of Solid State Physics, University of Latvia, Kengaraga Street 8, LV-1063 Riga, Latvia