A semiconductor structure, comprising a semiconductor substrate; at least one fin, wherein the at least one fin comprises one or more first layers and one or more second layers, wherein the first layers and the second layers are interspersed and the first layers laterally extend further than the second layers; a dummy gate structure comprising a first spacer material disposed on sidewalls of the dummy gate; a second spacer material disposed adjacent to each of the second layers, wherein sidewalls of the fin comprise exposed portions of each of the first layers and the second spacer material, and an epitaxial source/drain material disposed on at least the exposed portions of each of the first layers. Methods and systems for forming the semiconductor structure.