title: Frigge et al. reply.
authors.affiliation: Department of Physics, Center for Nanointegration (CENIDE), University of Duisburg-Essen, Lotharstraße 1, 47048 Duisburg, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Frigge
authors.forename: S
authors.initials: S
authors.lastname: Wall
authors.forename: B
authors.initials: B
authors.lastname: Krenzer
authors.forename: St
authors.initials: S
authors.lastname: Wippermann
authors.forename: S
authors.initials: S
authors.lastname: Sanna
authors.forename: F
authors.initials: F
authors.lastname: Klasing
authors.forename: A
authors.initials: A
authors.lastname: Hanisch-Blicharski
authors.forename: M
authors.initials: M
authors.lastname: Kammler
authors.forename: W G
authors.initials: WG
authors.lastname: Schmidt
authors.forename: M
authors.initials: M
authors.lastname: Horn-von Hoegen