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In this Comment, we show that the experimental data reported by Li {\it etal.} (Phys. Rev. B {\bf 77}, 134501 (2008)) do not support the phonon specularreflection at low temperatures for high-T_c cuprates, because the phonon meanfree path \ell calculated from their thermal conductivity data is much smallerthan the averaged sample width above \sim 100 mK for both Nd_{2}CuO_{4} andYBa_{2}Cu_{3}O_{6.0} single crystals.

physical review. b, condensed matter and materials physics

Comment on "Low-temperature phonon thermal conductivity of  single-crystalline Nd_{2}CuO_{4}: Effects of sample size and surface  roughness" by Li et al.