1. Laboratory for Vibrational Spectroscopy, BK21 Functional Polymer Thin Film Group, Department of Chemistry, Pohang University of Science & Technology, San 31, Hyojadong, Pohang 790-784, Republic of Korea, Materials Analysis Team, Research Institute of Industrial Science & Technology, San 32, Hyojadong, Pohang 790-330, Republic of Korea, and The Procter and Gamble Company, 8611 Beckett Road, West Chester, Ohio 45069