Transition-metal dichalcogenides (TMDs), such as monolayer NbSe₂ and NbS₂, are promising platforms for topological superconductivity. Their broken in-plane inversion symmetry and strong spin-orbit coupling (SOC) generate an out-of-plane effective magnetic field (Ising SOC), protecting superconductivity against strong in-plane fields and enabling unconventional singlet–triplet pairing. However, accessing the topological regime requires large shifts of the chemical potential. Misfit-layer compounds (MLCs) overcome this limitation through charge transfer from rock-salt layers to TMDs. In (LaSe)₁.₁₄(NbSe₂)₂, this transfer can reach 0.6 e⁻/Nb while preserving the NbSe₂ band structure and Ising SOC. Recent studies of (LaₓPb₁₋ₓSe)₁.₁₄(NbSe₂)₂ revealed a strongly non-monotonic superconducting phase diagram, with an abrupt transition near x = 0.4 from conventional s-wave pairing to a disorder-sensitive unconventional state. Orientation-dependent in-gap states at atomic step edges in the highly doped regime further suggest crystalline-topological superconductivity. This internship will investigate bulk MLCs and exfoliated monolayers using low-temperature scanning tunnelling microscopy/spectroscopy down to 300 mK, focusing on compositions near the topological transition. Particular attention will be paid to atomic defects and step edges to probe Cooper-pair symmetry. This work will pave the way toward electrically controlling the topological transition in a field-effect device.