1. Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824, Complex Systems Theory Branch, Naval Research Laboratory, Washington, DC 20375, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, Illinois 60208, Department of Physics and Astronomy, Clemson University, Clemson, South Carolina 29634, and R&D Division, Marlow Industries Inc., 10451 Vista Park Road, Dallas, Texas 75238