In this contribution small-angle scattering from layered systems is considered. When a colloidal dispersion is stirred it usually decomposes into layers. There are two important questions concerning these layers: What is the structure in a layer? What is the stacking structure between such layers? For concentrated colloidal dispersions both these questions can be investigated by small-angle scattering experiments. It will become apparent that the answer is also important for technical applications. Both a theoretical description as well as an experimental verification are given in the paper.