  X-ray diffractometers primarily designed for surface x-ray diffraction are
often used to measure the diffraction from powders, textured materials, and
fiber-texture samples in so-called $2\theta$ scans. There are, however, very
few examples where the measured intensity is directly used, such as for
Rietveld refinement, as is common with other powder diffraction data. Although
the underlying physics is known, converting the data is time-consuming and the
appropriate corrections are dispersed across several publications, often not
with powder diffraction in mind. In this paper we present the angle
calculations and correction factors required to calculate meaningful
intensities for $2\theta$ scans with a (2+3)-type diffractometer and an area
detector at the I07 beamline, Diamond Light Source. We also discuss some of the
limitations with respect to texture and instrumental resolution, and what kind
of information one can hope to obtain.
