“…Building on the concept of repositories as complementary to the publishing enterprise, rather than a possible alternative to it (see below), and taking advantage of the growing infrastructure around preprints, as well as their accelerating uptake by different research communities, overlay journals take upon themselves the certification function – the peer reviewing of articles, which is an important function of the scholarly journal that repositories do not perform (Priem & Hemminger, ; Tennant, Bauin, James, & Kant, ). Rounding out the role played by repositories, which typically do not go beyond a check by moderators if a paper fits thematically and is scientifically sound (Görögh et al ., ), the overlay journal is thus built as an additional peer reviewing layer on top of a publication repository, that is, it peer reviews the initial version of an article deposited, archived, registered, and made publicly available in a repository. If, following a conventional reviewing process, the article is accepted for formal publication in the overlay journal, its final version is reposted in the repository, assigned a DOI, and the journal publishes links to the paper from its own site (Pinfield, ).…”