Phoebe's paper explores the sensistivity of nanophotonic light trapping designs to the optical constants assumed for the metal. With the exception of aluminimum, there is strong divergence in the results. The work highlighting the need to determine the optical constants of the actual materials that will be deposited, ahead of designing a photonic light trapping structure. Full paper available from [ https://doi.org/10.1016/j.solmat.2018.11.008 ]