1. Materials Science and Engineering Program, Physical Sciences and Engineering Division; King Abdullah University of Science and Technology (KAUST); Thuwal Saudi Arabia 23955-6900
2. Department of Materials Science and Engineering; Stanford University; Stanford California 94305 USA
3. Department of Chemistry; University of Southern California; Los Angeles California 90089 USA
4. Stanford Synchrotron Radiation Lightsource; SLAC National Accelerator Laboratory; Menlo Park California 94025 USA