An out-of-plane detector movement has been built for the detector arm
of the surface x-ray diffractometer on the wiggler beam line 9.4 on th
e synchrotron radiation source at Daresbury Lab. For a relative small
cost, it significantly increases the volume of reciprocal space that c
an be accessed with a corresponding improvement in the accuracy of the
determination of the interatomic spacings. (C) 1996 American Institut
e of Physics.