Importance of the H2 abundance in protoplanetary disk ices for the molecular layer chemical compositionV. Wakelam, M. Ruaud, F. Hersant, A. Dutrey, D. Semenov, L. Majumdar and S. GuilloteauA&A, 594 (2016) A35DOI: https://doi.org/10.1051/0004-6361/201628748