Surface and thickness measurement in the Targetlab of GSI Birgit Kindler, Elif Celik Ayik, Annett Hübner, Bettina Lommel, Jutta Steiner and Vera Yakusheva EPJ Web Conf., 229 (2020) 02002 Published online: 28 February 2020 DOI: 10.1051/epjconf/202022902002