Bulk and surface characterisation techniques of solar absorbers: general discussion. (13th October 2022) - Andreasen, Jens Wenzel; Breternitz, Joachim; Bär, Marcus; Dale, Phillip J.; Dimitrievska, Mirjana; Fermin, David J.; Fleck, Nicole; Hages, Charles J.; Havryliuk, Yevhenii; Hawkins, Cara; Jaramillo, Rafael; Kavanagh, Seán R.; et al.