With regard to the topic of this review, the fabrication of stacked layers, it is important to note that SURMOF heterolayers, i.e., stacked 2D crystalline coordination networks, can be realized in a straightforward fashion by switching to different linkers and/or nodes during the lbl process. Thus, a programmed assembly of arbitrary sequences of MOF-heterolayers becomes possible. While in most cases stacked heterolayers are achieved by switching the organic linkers, in a few cases, also the metal nodes have been varied, e.g., in case of Cu/Zn. Particularly interesting, with regard to realizing mixed-metal MOFs, are lanthanide-based SURMOFs, since the very similar coordination chemistry of these metal ions allows switching between the different elements without pronounced changes of the MOF structure. Crystalline framework materials offer an additional means for functionality design: controlled van-der-Waals stacks of aromatic building blocks are subject to the proximity effect and raise phenomena such as wide absorption bands, mobile charge carriers, or indirect band gaps. Such stacks are present in layered MOFs and COFs, and can be created via steric control in 3D frameworks.