Structure for perovskites with layered ordering of A-site cations. Erratum

The scheme of structures shown in Fig. 1 of the paper by Howard & Zhang (2004) is incomplete. Structures corresponding to different tilt systems, allowing but not requiring the layered ordering of A-site cations, were inadvertently omitted. The corrected version of this schematic is shown by Howard & Stokes (2004) as their Fig. 5. The additional structures can be shown to be unsuitable as candidate structures for the compounds considered by Howard & Zhang, so the arguments used by Howard & Zhang (2004) for structure identification remain unaffected.