1. Fraunhofer Institute for Surface Engineering and Thin Films IST, Bienroder Weg 54E, Braunschweig 38108, Germany
2. School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
3. Institute of Machine Tools and Production Technologies, Technische Universität Braunschweig, Braunschweig 38106, Germany