CO Editor

Suggestions for revision or reasons for rejection

The authors responded to all my concerns. However, I am not totally satisfied:

1) The authors tried to explain the challenge mentioned in Munk (2009). However, this is not yet very clear to me. The authors mention some reflectance measurements presented in Breon and Henriot. What are these measurements about? I also noted that the author made no attempt to update the manuscript.

2) As mentioned earlier, it seems that the manuscript leverages on Leckert et al (2005), but their results are not explained properly. The authors cannot expect the reader to study Leckert et al. (2005) before reading their manuscript. From the marked version is also quite clear that there is not additional explanation to explain Leckert et al. (2005), despite additional discussion being promised in the rebuttal. The only additional text refer to the contents of the manuscript.

3) the difference contribution generates subharmonics, the frequency of which is w_{diff} = \Delta(w) and k_{diff} = Delta k. I do not understand why the authors says that the difference wave number is indeed a difference while the difference frequency is a sum. Can the authors be more specific? (note that psi_i - psi_j in second order, means k_i X - w_i t - k_j + w_j t; this means k_i - k_j and w_j-w_i)

4) page 4, line 18, what do the question marks refer to?

Interactive discussion

Peer-review completion