Retraction notice to "Two-dimensional GaTe monolayer as a potential gas sensor for SO2 and NO2 with discriminate optical properties" [Superlattices and Microstructures 135C (2019) 106245]. (October 2021) - Al-Abbas, Shurooq Sabah Abed; Muhsin, Musa Kadhim; Jappor, Hamad Rahman