Linked from
The 18 pages that link to Spin–orbit interaction, each with the reason it gives.
Electron spinRelated: It links electron spin to motion through an atom’s electric field.
SpinRelated: This coupling links intrinsic spin to motion in an external potential.
4f electronRelated: It splits and organizes the energy levels of lanthanide 4f configurations.
Atomic propertiesRelated: It contributes to fine structure in atomic energy levels and spectra.