1. C.-F. Chou, Department of Physics, Princeton University, Princeton, NJ 08544, USA.
2. A. J. Jin, Applied Materials, 3320 Scott Boulevard, Mailstop 1114, Santa Clara, CA 95054, USA.
3. S. W. Hui, Department of Biophysics, Roswell Park Cancer Institute, Buffalo, NY 14263, USA.
4. C. C. Huang, School of Physics and Astronomy, University of Minnesota, Minneapolis, MN 55455, USA.
5. J. T. Ho, Department of Physics, State University of New York at Buffalo, Buffalo, NY 14260, USA.