1. Department of Materials Science and Engineering and The Russell Berrie Nanotechnology Institute Technion – Israel Institute of Technology Haifa 32000 Israel
2. ESRF ‐ The European Synchrotron Radiation Facility CS 40220, Grenoble Cedex 9 38043 France
3. Physics Department Nuclear Research Centre ‐ Negev P.O. Box 9001 Beer‐Sheva 84190 Israel
4. Israel Atomic Energy Commission P.O. Box 7061 Tel‐Aviv 61070 Israel
5. The Nancy and Stephen Grand Technion Energy Program Technion − Israel Institute of Technology Haifa 3200003 Israel