2DEG AS A/GaAs Variation and elaboration of an illustration for an article on two dimensional electron gases in Physics Today. This image began as an illustration for an article on two dimension al electron gases in Physics Today. Depicting various layers in the micron sized heterostructures, and especially the electron donating atoms together with the effective potential energy landscape whic induce on the electrons living in the interfacial layer between Gallium Arsinide and Aluminum Gallium Arsinide semiconductor crystals, the original image invited variation and elaboration2DEG Variation and elaboration of an illustration for an article on two dimensional electron gases in Physics Today. This image began as an illustration for an article on two dimensional electron gases in Physics Today. Depicting various layers in the micron sized heterostructures, and especially the electron donating atoms together with the effective potential energy landscape which induce on the electrons living in the interfacial layer between Gallium Arsinide and Aluminum Gallium Arsinide semiconductor crystals, the original image invited variation and elaboration