Additionally, the individual MOF layers provide strong anisotropic transport properties for excitons and other optical excitations. In some systems, exceptionally large exciton diffusion lengths have been determined experimentally. In that work, it was proposed that the observed experimental value of around 100 nm is actually only limited by the domain size of the investigated SURMOFs. Based on theoretical considerations, the intrinsic exciton diffusion length should reach the micrometer-regime, which would make this thin layer MOF one of the best exciton transport materials.