1. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
2. Materials
Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
3. Department of Physics and Liquid Crystal
Materials Research Center, University of Colorado, Boulder, Colorado 80309, United States
4. Department of Chemistry and Biochemistry and Liquid Crystal
Materials Research Center, University of Colorado, Boulder, Colorado 80309, United States