  Using density functional theory combined with orbital-selective band
unfolding techniques, we study the effective band structure of
silicene($3\times3$)/Ag(111)($4\times4$) structure. Consistent with the ARPES
spectra recently obtained by Feng et al. [Proc. Natl. Acad. Sci. 113, 14656
(2016)], we observe six pairs of Dirac cones near the boundary of the Brillouin
zone (BZ) of Ag($1\times1$), while no Dirac cone is observed inside the BZ.
Furthermore, we find that these Dirac cones are induced by the interfacial
Si-Ag hybridization, mainly composed of Si p$_z$ orbitals and Ag sp bands,
which is intrinsically different from the Dirac cones in freestanding silicene.
