Figure 2. Combined μ-XRF/XRD tomography on a layered paint fragment at a synchrotron microfocus beamline. For each translation–rotation step (xi , ωk ) an XRF spectrum and 2D-XRD pattern are produced. The corresponding radial scatter profile, obtained by azimuthal integration of the CCD-camera image, can be decomposed in several crystallographic phase contributions. The S-coefficients form the sinograms Sc(x,ω) from which distribution maps gc(x, y) are calculated.