1. Central Facility of Materials Science Electron Microscopy, Universität Ulm, 89081 Ulm, Germany
2. Faculty of Chemistry and Food Chemistry & Center for Advancing Electronics Dresden (cfaed), Technische Universität Dresden, 01062 Dresden, Germany
3. Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, 3584 CC Utrecht, The Netherlands
4. Max Planck Institute for Solid State Research and Center of Integrated Quantum Network, Heisenbergstraße 1, 70569 Stuttgart, Germany