Elsevier mirror journals with the same titles as the originals with an additional "X" - WUR

"Elsevier introduced about 40 mirror journals, also known as X-journals, which enable researchers to publish Open Access and as such meet the requirements of Plan S and other funders. These mirror journals have the same title as the original with an additional X, e.g. Food Chemistry: X. Mirror journals are very similar to the original - with the same editorial board, aims, scope and peer review policies – but differ in business model and have no impact factors yet...."