Comment on "Transport coefficients for magnetic-field evolution in inviscid magnetohydrodynamics" [Phys. Plasmas 28, 012305 (2021)]

A recent paper by Davies et al. [Phys. Plasmas 28, 012305 (2021)] presents rational interpolants for the resistive (alpha) and thermoelectric (beta) transport coefficients as functions of the Hall parameter chi and the ion charge state Z. Here, this discussion is augmented by showing that, at least in the Lorentz limit Z ->infinity, the proposed rational interpolants for alpha(perpendicular to) and beta(perpendicular to) can be made even more accurate over a larger range of chi by making slight modifications to ensure the exact asymptotic limits are preserved. Although the authors do not discuss the conductivity (kappa) coefficients, this exercise can also be repeated for the rational interpolants of kappa(perpendicular to) and kappa(boolean AND) published in a similar work [Phys. Rev. Lett. 126, 075001 (2021)].