Non catalytic subunit of RNase H2, an endonuclease that specifically degrades the RNA of RNA:DNA hybrids. Participates in DNA replication, possibly by mediating the removal of lagging-strand Okazaki fragment RNA primers during DNA replication. Mediates the excision of single ribonucleotides from DNA:RNA duplexes. The RNase 2 complex is a heterotrimer composed of the catalytic subunit RNH201 and of the non-catalytic subunits RNH202 and RNH203. Present with 2340 molecules/cell in log phase SD medium. Belongs to the RNase H2 subunit B family. Highly divergent.