1. Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, University of Freiburg, Stefan-Meier-Strasse 21 and 31, 79104 Freiburg, Germany
2. JONAS − Joint Research on Advanced Materials and Systems, Advanced Materials & Systems Research, BASF SE, Carl-Bosch-Strasse 38, 67056 Ludwigshafen, Germany
3. Institute of Physics, University of Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany