  We put forward an experimental configuration to observe transverse Anderson
localization of partially coherent light beams with a tunable degree of
first-order coherence. The scheme makes use of entangled photons propagating in
disordered waveguide arrays, and is based on the unique relationship between
the degree of entanglement of a pair of photons and the coherence properties of
the individual photons constituting the pair. The scheme can be readily
implemented with current waveguide-on-a-chip technology, and surprisingly, the
tunability of the coherence properties of the individual photons is done at the
measurement stage, without resorting changes of the light source itself.
