1. Materials and Devices Applications Laboratory, Sharp Laboratories of America, Inc., 5750 NW Pacific Rim Blvd., Camas, Washington 98607, United States
2. Applied Physics Division, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, United States
3. Material Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, Maryland 20899, United States