1. Hashimoto Polymer Phasing Project, ERATO, JRDC, Keihanna Plaza, 1-7 Hikari-dai, Seika-cho, Kyoto 619-02, Japan, and Division of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Kyoto 606, Japan
2. Neutron Scattering Laboratory, Department of Materials Science and Engineering, Japan Atomic Energy Research Institute, Tokai-mura 319-11, Japan