1. Lehrstuhl für Funktionelle Materialien; Physik-Department; Technische Universität München; James-Franck-Str., 1 85748 Garching Germany
2. Department of Polymer Science and Engineering; University of Massachusetts Amherst; 120 Governors Drive Amherst MA 01003 USA
3. Materials Sciences Division; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720 USA
4. Advanced Light Source; Lawrence Berkeley National Laboratory; 1 Cyclotron Road Berkeley CA 94720 USA