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High-level first-principles computations predict blue phosphorene bilayer tobe a two-dimensional metal. This structure has not been considered before andwas identified by employing a block-diagram scheme that yields the complete setof five high-symmetry stacking configurations of buckled honeycomb layers, andallows their unambiguous classification. We show that all of these stackingconfigurations are stable or at least metastable configurations both for bluephosphorene and gray arsenene bilayers. For blue phosphorene, the most stablestacking configuration has not yet been reported, and surprisingly it ismetallic, while all other arrangements are indirect band gap semiconductors. Asit is impossible to interchange the stacking configurations by translations,all of them should be experimentally accessible via the transfer of monolayers.The metallic character of blue phosphorene bilayer is caused by its shortinterlayer distance of 3.01 {\AA} and offers the exceptional possibility todesign single elemental all-phosphorus transistors.

Blue phosphorene bilayer is a two-dimensional metal -- and an unambiguous classification scheme for buckled hexagonal bilayers