1. Nanoscale Device Characterization Division, Physical Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA.
2. Materials Measurement Science Division, Materials Measurement Laboratory, NIST, Gaithersburg, MD 20899, USA.
3. Department of Materials Science and Engineering, Ohio State University, Columbus, OH 43210, USA.
4. Physics, Astronomy, and Geosciences, Towson University, Towson, MD 21252, USA.
5. Center for Emergent Materials, Department of Physics, The Ohio State University, Columbus, OH 43210, USA.