1. Institute of Physics Slovak Academy of Sciences Dúbravská cesta 9 Bratislava 845 11 Slovakia
2. Centre for Advanced Materials Application Slovak Academy of Sciences Dúbravská cesta 9 Bratislava 845 11 Slovakia
3. Photon Science Deutsches Elektronen‐Synchrotron (DESY) 22607 Hamburg Germany
4. KTH Royal Institute of Technology Department of Fibre and Polymer Technology Teknikringen 56‐58 Stockholm SE‐100 44 Sweden
5. Department of Physics Boston University 233 Bay State Road Boston MA 02215 USA
6. Institute of Applied Physics University of Tübingen Auf der Morgenstelle 10 D‐72076 Tübingen Germany
7. Institute for Advanced Materials and Technology University of Science and Technology Beijing Beijing 100083 China