1. Polymers Branch, U.S. DEVCOM Army Research Laboratory, Aberdeen Proving Ground, Maryland 21005, USA
2. Materials Measurement Science Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
3. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan
4. Industrial Application Division, Spring-8, Japan Synchrotron Radiation Research Institute (JASRI), 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
5. Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA