Reviewer’s comments to the Author are the same as comments to the Editor:
Despite the local mass spectrometric problem solved in the manuscript under consideration, it has the large heuristic value. The local because only one sample of rhenium disulfide (ReS2) is considered; the large because at the conditions of laser desorption-ionization it produces the huge variety of charged rhenium sulfide clusters. Most of these clusters can be identified unambiguously (with several exceptions, of course) due to using the algorithm of “brute force approach” developed by authors earlier.
However, the first impression of the text – it is too wordy. The section “Results and Discussion” contains 11 pages (from 9 to 20), but includes no additional sub-rubricating., that makes it rather difficult for reading. It should be divided into several sub-sections, e.g., “positive mode”, “negative mode”, “molybdenum-containing clusters”, “S – O2 interference”, or something like that.
The second problem for questions is the reproducibility of LDI mass-spectra. Of course, it is not the reproducibility within clusters (high), but inter-clusters one. Some authors’ comments about that should be added to Experimental.
Thirdly, Tables 1 and 3 contain the relative intensities (%) of rhenium sulfide clusters of the RexSy+. type observed in positive and negative modes. However, these arrays do not contain the values 100%. Therefore, it is unclear what these percentages are relative to. Moreover, these intensities should depend on the parameters of ionization, namely wavelength, quantum energy, pulse duration (probably), etc. All such information should be provided together with the relative intensities in these Tables. Besides that, all values are presented with four significant digits that seem to be too many. Their rounding up to only one decimal digit is recommended.

Less fundamental question is the follows: The symbol M/z is used in the text instead of commonly recommended m/z. Why?

After answering the above questions and corresponding corrections of the text (minor or moderate revision) the manuscript can be recommended for publication in RCM.