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Unlike silicene, for which the demonstration of its existence has been donethrough numerous independent studies, the possibility of growing epitaxialgermanene remains highly controversial. It has been recently shown by scanningtunneling microscopy that the (3 x 3) surface reconstruction formed upon Gedeposition on Al(111) presents a honeycomb structure, and it was assigned to apure germanene monolayer. Using quantitative measurements by surface X-raydiffraction compared to density functional theory calculations, we demonstratethat this Ge/Al(111) (3 x 3) reconstruction corresponds, in fact, to a mixedGe--Al honeycomb layer on top of an alloyed interfacial layer. The model of agermanene monolayer on top of the Al(111) surface can be completely excluded.

Structure of germanene/Al(111): a two-layers surface alloy