1. F. Hide, M. A. Díaz-García, B. J. Schwartz, M. R. Andersson, A. J. Heeger, Institute for Polymers and Organic Solids, University of California, Santa Barbara, Santa Barbara, CA 93106-5090, USA.
2. Q. Pei, UNIAX Corporation, 6780 Cortona Road, Santa Barbara, CA 93117, USA.