The fascinating electronic properties of graphene have led to the exploration of other single-element 2D materials with honeycomb-like structure, such as silicene, germanene, stanene and phosphorene . Some of these materials are expected to display significant analogies to graphene, in the free-standing form, due to the presence of Dirac cones near the Fermi level . The synthesis on solid surfaces, however, poses questions on the preservation of the 2D character of the electronic states. In this talk I will present the paradigmatic case of silicene on Ag(111), where silicon forms different allotropic honeycomb-like phases . I will show that for all phases symmetry-selective hybridization with the Ag sp-states destroys the π-derived Dirac cone features near the Fermi level, while σ-derived bands at deeper energies are weakly affected by the substrate [4,5].
 S. Balendhran et al., Small 11, 640 (2015).
 L. Matthes et al., J. Phys.: Condes. Matter 25 , 395305 (2013).
 P. Moras et al., J. Phys.: Condens. Matter 26, 185001 (2014).
 S. Mahatha et al., Phys. Rev. B 89, 201416 (2014).
 P. M. Sheverdyaeva et al., ASC Nano 11, 975 (2017).