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In a recent publication, Lee $et$ $al.$ discussed experimental observation ofKlein tunneling into a proximity-induced topological superconducting state ofSmB$_{6}$ through the measurement of Andreev reflection with low-biasconductance doubling across point-contact junctions between sharp Pt-Ir tipsand SmB$_{6}$/YB$_{6}$ heterostructures. However, the interpretation of thepresented point-contact data is rather ambiguous because observing a low-biasconductance enhancement by a factor of 2 is not special for Klein tunnelinginto topological superconductors. Such an enhanced conductance can be observedin point contacts between all types of superconductors and normal metals whenthe contacts are neither in the ballistic nor in the diffusive regimes ofmesoscopic transport, but in a dissipative thermal regime. The thermal regimeis expected for the point contacts presented in Lee $et$ $al.$ primarilybecause of the anticipated very short electron mean free path of SmB$_6$ -- wewill discuss this in more detail here.

Comment on "Perfect Andreev reflection due to the Klein paradox in a topological superconducting state (Nature \textbf{570}, 344 (2019))"