Two-dimensional band dispersion of $\left(2\times 2\right)$ superstructure with Bi grown on Ag(111), which has been proposed as an ultraflat hexagonal bismuthene, is investigated using angle-resolved photoemission spectroscopy (ARPES). The $\left(2\times 2\right)$-Bi superstructure can be grown on the Ag(111) surface at low temperatures; it transforms into a surface alloy with a $\left(\sqrt{3}\times \sqrt{3}\right)$ superstructure at 300 K. ARPES measurements are in agreement with the band structure of ultraflat bismuthene in previous reports. The band structure of $\left(2\times 2\right)$-Bi surface remains unchanged with decreasing Ag layer thickness, indicating the limited penetration of Bi $p$ orbitals into the Ag layer.

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• 2-dimensional systems
• Topological materials
• Angle-resolved photoemission spectroscopy