The article discusses how studying second order Raman spectra of two-dimensional materials can provide more information about their electronic structure than first order Raman spectra. By combining traditional Raman theory with double resonance conditions, researchers can understand why this phenomenon is prominent in these materials. The double resonance Raman spectra reveal details about the phonon waves in the materials' Brillouin zone, and how they can shift with changes in laser energy. The study focuses on graphene and transition metal dichalcogenides, using theoretical analysis to explain these findings.