Hilke, M.Flores, J. C.Domínguez-Adame Acosta, Francisco2023-06-202023-06-201998-10-011. X. Huang, X. Wu, and C. Gong, Phys. Rev. B 55, 11 018 (1997). 2. J. C. Flores and M. Hilke, J. Phys. A 26, L1255 (1993). 3. M. Hilke, J. Phys. A 27, 4773 (1994). 4. Ph. Jacquod and D. L. Shepelyansky, Phys. Rev. Lett. 75, 3501 (1995). 5. F. Domínguez-Adame, E. Maciá, and A. Sánchez, Phys. Rev. B 48, 6054 (1993). 6. M. Hilke and J. C. Flores, Phys. Rev. B 55, 10 625 (1997).0163-182910.1103/PhysRevB.58.8837https://hdl.handle.net/20.500.14352/59363© 1998 The American Physical Society. Part of this work was made possible due to the project FDI-Chile (J.C.F. and M.H.).In a recent report, Huang, Wu, and Gong [Phys. Rev. B 55, 11018 (1997)] studied numerically the electronic properties of a random dimer model (RDM) and found extended periodic wave functions near the critical energies. We argue that there are no periodic wave functions in the RDM but close to the critical energies there exist periodic envelopes. These envelopes are given by the nondisordered properties of the system.engjournal articlehttp://dx.doi.org/10.1103/PhysRevB.58.8837http://journals.aps.org/open access538.9Disordered-SystemsFísica de materiales