Cross-correlation of electron backscatter diffraction patterns has been used to generate rotation maps of single crystals of tetragonal barium titanate (BaTiO3) containing multiple lamellae and bundles of approximate to 90 degrees domains. Rotation measurement angular resolutions of 0.1mrad (0.006 degrees) and spatial resolutions of 30nm are demonstrated on structures with approximately 1m domains extending over 10s of m. The material orientations demonstrated considerable microstructural dependence: c domains, with polarization perpendicular to a free surface, exhibited little within-domain rotation variation while a-domains, with polarization parallel to the surface, exhibited considerable within-domain variation, particularly in the larger lamellar domain structure. In both lamellar and bundled structures, the maximum a-c between-domain rotation was approximately equal to the value (r)approximate to 0.63 degrees (11mrad) predicted by a rigid rotation of tetragonal BaTiO3 unit cells across the domain boundary. However, in both structures there was gradual variation in rotation throughout, especially adjacent to domain boundaries, suggesting that a rigid rotation model predicts too abrupt a unit cell and polarization rotation. A new BaTiO3 compound defect was deduced through identification of a double integral surface rotation 2(r). The double rotation is indicative of a low-angle grain boundary terminating at a surface by a confined 90 degrees domain.