1. Department of Chemistry and the Materials Research Center, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113; IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099; Organized Research Program on Polymeric Ultrathin Film Systems, Department of Electrical Engineering and Computer Science, University of California, Davis, Davis, California 95616; and Adven Polymers, 1072 South DeAnza Boulevard, San Jose, California 95129