  We developed a setup using a two dimensional camera for Grazing Incidence
x-ray Diffraction (GIXD) on Langmuir monolayers and more generally for surface
diffraction on two dimensional powders. Compared to the classical setup using a
linear detector combined with Soller's slits, the acquisition time is reduced
of a factor of at least 10 (from more than one hour to a few minutes) using the
same x-ray source (synchrotron bending magnet) with a comparable signal to
noise ratio. Moreover, using an horizontal gap slit, the experimental
resolution can be adjusted and for small values of the gap, better resolution
can be achieved compared to the one obtained with the linear detector.
