1. Materials Research Group, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
2. National Centre for Advanced Tribology at Southampton, Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, UK
3. Faculty of Engineering, Environment, and Computing, Coventry University, Coventry, UK
4. National Laser Centre, Council for Scientific and Industrial Research, Pretoria, South Africa
5. Airbus Operations GmbH, Hamburg, Germany