Quasi 2-D and even quasi 1-D materials are at the forefront of many ideas for molecular devices. I plan to present a panorama driven by the possibility of simulating small and medium sized flakes and ribbons of such materials by DFT calculations with a fairly high confidence that they predict the behaviour of such materials at least qualitatively very well. In the domain of transport through Benzene and small polyacenes we shall even present experiments where transmissions have been measured and compared with tight binding calculations and emulation experiments with microwaves. This brings us directly to ring currents which seem to occur at certain voltages and in turn connect the subject with the one of (non-superconducting) persistent currents.

* Thomas H. Seligman, Instituto de Ciencias Fïscas,  University of Mexico (UNAM)
and Centro Internacional de Ciencias Cuernavaca, Mexico