[1
]Materials Science and Engineering, University of California, Riverside, California
92521, United States
[2
]Department of Physics, The Ohio State University, Columbus, Ohio 43210, United States
[3
]Center for Electron Microscopy and Analysis, The Ohio State University, Columbus,
Ohio 43212, United States
[4
]Department of Materials Science and Engineering, The Ohio State University, Columbus,
Ohio 43210, United States
[5
]Department of Electrical and Computer Engineering, The Ohio State University, Columbus,
Ohio 43210, United States
[6
]Semiconductor Epitaxy and Analysis Laboratory, The Ohio State University, Columbus,
Ohio 43210, United States