1. Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, CA 94025, USA.
2. Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
3. Institute for Materials Research, Tohoku University, Katahira 2-1-1, Sendai, 980-8577, Japan.
4. Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada.
5. Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada.
6. The Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA.
7. Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.
8. Geballe Laboratory for Advanced Materials, Departments of Physics and Applied Physics, Stanford University, Stanford, CA 94305, USA.
9. SLAC National Accelerator Laboratory, Menlo Park, CA 94025, USA.