title: The atomic anisotropic displacement tensor – completing the picture.
abstract: A simplified approach for calculating the equivalent isotropic displacement parameter is presented and the transformation property of the tensor representation U to point-group operations is analysed. Complete tables have been compiled for the restrictions imposed upon the tensor owing to the site symmetry associated with all special positions as listed in Hahn [(2011), International Tables for Crystallography, Vol. A, Space-group Symmetry, 5th revised ed. Chichester: John Wiley and Sons, Ltd].
authors.affiliation: Department of Mathematics and Natural Science, University of Stavanger, N-4036 Stavanger, Norway.
authors.forename: Gunnar
authors.initials: G
authors.lastname: Thorkildsen
authors.affiliation: Department of Mathematics and Natural Science, University of Stavanger, N-4036 Stavanger, Norway.
authors.forename: Helge B
authors.initials: HB
authors.lastname: Larsen
keywords: anisotropic displacement tensor; equivalent isotropic displacement parameter; site-symmetry restrictions; transformations among tensor representations