1. Materials
Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
2. N5 Sensors, Inc., Rockville, Maryland 20852, United States
3. Institute for Research in Electronics and
Applied Physics, University of Maryland, College Park, Maryland 20742, United States
4. Department of Physics, Seton Hall University, South Orange, New Jersey 07079, United States
5. Semiconductor and Dimensional Metrology Division, Physical Measurement
Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States