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We thank the United States Air Force Office of Scientific Research for support through F49620-00-1-0103 and the Army Research Office for support of a MURI through DAAD19-99-1-0316. The authors thank Dr. M. Bendikov, Dr. R. Helgeson at EMI, UCLA, and Dr. Z. Bao, Lucent Technologies, for many valuable discussions. We are grateful to Mr. J. Huang for TEM measurements, Dr. S. I. Khan for the X-ray crystallographic analysis, Dr. R. E. Taylor for help with solid-state 13C NMR and ESR measurements (Department of Chemistry and Biochemistry, UCLA), Dr. G. Z. Pan, of the Microfabrication Lab (UCLA), Mr. W. Yu, Mr. W. Dong, and Prof. S. Brown of the Department of Physics (UCLA) for help with conductivity measurements.