1. Faculty of Engineering Sciences and Mathematics, Bielefeld University of Applied Sciences and Arts, 33619 Bielefeld, Germany
2. School of Sciences, Universidad de las Américas Puebla, Puebla 72810, Mexico
3. Thin Films and Physics of Nanostructures, Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
4. Institute of Physics—Center for Science and Education, Silesian University of Technology, 44-100 Gliwice, Poland