1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
2. Department of Mechanical Engineering, University of California, Berkeley, CA 94720, USA.
3. Department of Materials Science and Engineering, Photon Science, Stanford University, Stanford, CA 94305, USA.
4. Department of Chemistry, University of California, Berkeley, CA 94720, USA.
5. Stanford Synchrotron Radiation Laboratory, Palo Alto, California, 94025, USA.
6. National Center for Electron Microcopy, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.