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. Innovative Devices Section
7. Center for Integrated Research of Future Electronics
8. Institute of Materials and Systems for Sustainability
9. Nagoya University Furocho
10. Nagoya
11. Synchrotron X-ray Group
12. Research Center for Advanced Measurement and Characterization
13. NIMS
14. Sayo
15. 679-5148 Japan