1. Center for GaN Characterization
2. Research Network and Facility Services Division (RNFS)
3. National Institute for Materials Science (NIMS)
4. Tsukuba
5. 305-0047 Japan
6. Synchrotron X-ray Group
7. Research Center for Advanced Measurement and Characterization
8. NIMS
9. Sayo
10. 679-5148 Japan