High-resolution transmission electron microscopy has been used to image the atomic structure of the (2S2)γaustenite-martensite interface. By imaging along [101]γ∥[111]α, the interface was viewed edge-on and seen to consist of facets on the close-packed (111)γ, planes. From the correspondence of atoms in the close-packed planes across the austenite-martensite interface, the magnitude of the shear can be analysed as (a/24)<112> on every close-packed plane in the plane of projection. Comparison with theory indicates that this is an (a/12)<112> Burgers vector out of the plane of projection. Hence, each atomic facet can be viewed as a structural ledge containing an (a/12)<112> transformation dislocation.