1. Karlsruhe Institute of Technology
2. Laboratory for Applications of Synchrotron Radiation
3. Karlsruhe 76131
4. Germany
5. AGH University of Science and Technology
6. National Technical University of Athens
7. Department of Physics
8. Athens 15780
9. Greece
10. N. C. S. R. “Demokritos”
11. Institute of Nuclear and Particle Physics
12. X-ray Fluorescence Analysis Laboratory
13. Athens 15341