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Two-dimensional (2D) honeycomb lattices beyond graphene, such as germanene,promise new physical properties such as quantum spin Hall effect. While therehave been many claims of growth of germanene, the lack of precise structuralcharacterization of the epitaxial layers synthesized hinders further research.The striped layer formed by Ge deposition on Ag(111) has been recently ascribedas a stretched germanene layer. Using surface X-ray diffraction and densityfunctional theory calculations, we demonstrate that it corresponds in fact to aAg$_2$Ge surface alloy with an atomic density 6.45% higher than the Ag(111)atomic density. The overall structure is formed by stripes associated with aface-centered cubic top-layer alignment, alternating with stripes associatedwith an hexagonal-close-packed top-layer alignment, in great analogy with the($22\times\sqrt3$) Au(111) reconstruction.

Resolving the structure of the striped Ge layer on Ag(111): Ag$_2$Ge surface alloy with alternate fcc and hcp domains