1. Corporate Sector Research and Advance Engineering, Robert Bosch GmbH, Robert-Bosch-Campus 1, 71272 Renningen, Germany
2. Institute for Telecommunications Technology, Darmstadt University of Technology, Merckstrasse 25, 64283 Darmstadt, Germany
3. Department of Materials and Earth Sciences, Darmstadt University of Technology, Merckstrasse 25, 64283 Darmstadt, Germany