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We have fabricated a 180$^\circ$-twisted bilayer ReSe$_2$ by stacking twocentrosymmetric monolayer ReSe$_2$ flakes in opposite directions, which isexpected to lose spatial inversion symmetry. By the second harmonic generationand angle-resolved photoemission spectroscopy, we successfully observed spatialinversion symmetry breaking and emergent band dispersions. The band calculationshows the finite lifting of spin degeneracy (~50 meV) distinct from naturalmonolayer and bilayer ReSe$_2$. Our results demonstrate that the spin-momentumlocked state, which leads to spintronic functions and Berry-curvature-relatedphenomena, can be realized even with the stacking of centrosymmetricmonolayers.

180$^\circ$-twisted bilayer ReSe$_2$ as an artificial noncentrosymmetric semiconductor