1. School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, Oregon 97330, United States
2. Sandia National Laboratories, Albuquerque, New Mexico 87185, United States
3. Materials Measurement Science Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, United States
4. Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, United States
5. Charles L. Brown Department of Electrical and Computer Engineering, University of Virginia, Charlottesville, Virginia 22904, United States