1. Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, Nebraska 68588, USA
2. Leibniz-Institut für Kristallzüchtung, 12489 Berlin, Germany
3. Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003, USA
4. Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Sweden
5. Leibniz Institut für Polymerforschung e.V., 01069 Dresden, Germany