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In a recent work by Ji Seop Oh et al., BaBiO3(001) thin films were grown onSrTiO3 by Pulsed Laser Deposition. It was argued that the films areBiO2-terminated from the modelling of angle-resolved photoemission spectroscopyexperiments. The authors claim, in opposition to previous theoreticalpredictions, that there are no metallic surface states on their films. In thisshort comment we question that the authors have enough evidence to make such aclaim, as we consider that the large mismatch between SrTiO3 and BaBiO3 and thelack of control of their fabrication process with reflection high energyelectron difraction could unlikely give high quality films with a single BiO2-termination, which is one of the requisites for the stabilization of thesesurface metallic states.

Comment on "Evidence for absence of metallic surface states in BiO2-terminated BaBiO3 thin films"