1. Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218,
USA
2. Material Measurement Laboratory, Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899,
USA
3. Lawrence Livermore National Laboratory, Materials Science and Technology Division, Livermore, California
94550, USA
4. Institute of Applied Materials, Karlsruhe Institute of Technology, 76344 Eggenstein-Leopoldshafen,
Germany