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Crystal rotations occurring in the axial strain interval 0-15% have been measured and analysed in detail for two grains on the surface of a Cu polycrystal. Original results for one of the grains are presented in this article. During deformation, the grains subdivide into uniform coarse domains, each domain defined by a characteristic rotation away from the initial crystal orientation. The crystal rotation angles within all of the uniform coarse domains exceed those predicted by the Taylor model, but are similar to rotations predicted by a Sachs type model with single or duplex slip. Subdivision of the grains into uniform coarse domains can be interpreted as a mechanism for partial compensation of the strain incompatibility associated with predominately single or duplex slip, simultaneously reducing the work of deformation by reducing the total shear amplitude compared with that required for uniform codeformation.