Affiliation: | (1) Department of Materials Science & Engineering, University of California at Berkeley, 94720-1760 Berkeley, CA;(2) Present address: Department of Materials Science & Engineering, Massachusetts Institute of Technology, 02139 Cambridge, MA;(3) Present address: Xerox Palo Alto Research Center, 94304 Palo Alto, CA;(4) Present address: General Electric Corporate Research and Development, 12309 Niskayuna, NY |