1. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany
2. Institute of Solid State Physics of the Russian Academy of Sciences, 2 Academician Ossipyan Street, Chernogolovka, Moscow District 142432, Russian Federation
3. CRANN, School of Physics, Trinity College Dublin, Dublin 2, Ireland
4. National Research University of Information Technologies, Mechanics and Optics, Kronverksky prospekt 49, 197101 Saint Petersburg, Russian Federation
5. Institut für Physik, Johannes Gutenberg-Universität, Staudingerweg 7, D-55099 Mainz, Germany
6. Elettra Sincrotrone Trieste S.C.p.A., S.S. 14 km 163.5 in AREA Science Park, I-34149 Basovizza, Trieste, Italy
7. Institute of Experimental Physics, TU Bergakademie Freiberg, Leipziger Straße 23, D-09599 Freiberg, Germany
8. Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Straße 15, D-12489 Berlin, Germany