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In a recent Letter by Romanenko et al., the authors used low-energy muon spinrotation (LE-$\mu$SR) to measure the Meissner screening profile in cutouts fromNb superconducting radio frequency (SRF) cavities, systematically comparing howdifferent surface treatments affect the screening properties of the elementaltype-II superconductor. They reported a "strong" modification to the characterof the screening profile upon mild baking at 120 $^{\circ}$C for 48 h, whichwas interpreted as a depth-dependent carrier mean-free-path resulting from a"gradient in vacancy concentration" near the surface. While this observationled to speculation that this surface treatment yields an "effective"superconducting bilayer, we suggest that its likeness to such is accidental andthat the behavior is an artifact from the analysis.

Comment on "Strong Meissner screening change in superconducting radio frequency cavities due to mild baking" [Appl. Phys. Lett. 104, 072601 (2014)]