  Diffraction from a lattice of periodically spaced crystals is a topic of
current interest because of the great development of self-organised
superlattices (SL) of nanocrystals (NC). The self-organisation of NC into SL
has theoretical interest, but especially a rich application prospect, as the
coherent organisation has large effects on a wide range of material properties.
Diffraction is a key method to understand the type and quality of SL ordering.
Hereby the characteristic diffraction signature of a SL of NC - together with
the characteristic types of disorder - are theoretically explored.
