There is a typo of the space group. All the Pnmb should be Pbnm (or Pnma). So the Glazer notation should be changed to (a−a−c+) for Pbnm space group on page 4 of the article.1 We have also noticed that the thermodynamic analysis of CaTiO3 thin film is not correct.
M. D. Biegalski et al., "Erratum: "Impact of Symmetry on the Ferroelectric Properties of CaTiO₃ Thin Films" (Applied Physics Letters 106:162904 (2015))," Applied Physics Letters, vol. 106, no. 21, American Institute of Physics (AIP), May 2015.
The definitive version is available at https://doi.org/10.1063/1.4921711
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