1. Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter University of Pennsylvania, Philadelphia, Pennsylvania 19104; and NIST Center for Neutron Research National Institute of Standards and Technology Gaithersburg, Maryland 20899
2. Department of Materials Science and Engineering and Laboratory for Research on the Structure of Matter University of Pennsylvania, Philadelphia, Pennsylvania 19104
3. Honeywell International, Inc., P.O. Box 1021R, Morristown, New Jersey 07962