Published in Appl. Phys. Lett. 75, 808 (1999).
V. Ramachandran and R. M. Feenstra Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 W. L. Sarney and L. Salamanca-Riba Materials and Nuclear Engineering Department, University of Maryland, College Park, MD 20742-2115 J. E. Northrup and L. T. Romano Xerox Palo Alto Research Center, 3333 Coyote Hill Road, Palo Alto, California 94304 D. W. Greve Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
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