  Rashba spin-orbit coupling is a quintessential spin interaction appearing in
virtually any electronic heterostructure. Its paradigmatic spin texture in the
momentum space forms a tangential vector field. Using first-principles
investigations, we demonstrate that in twisted homobilayers and
hetero-multilayers, the Rashba coupling can be predominantly radial, parallel
to the momentum. Specifically, we study four experimentally relevant
structures: twisted bilayer graphene (Gr), twisted bilayer WSe$_2$, and twisted
multilayers WSe$_2$/Gr/WSe$_2$ and WSe$_2$/Gr/Gr/WSe$_2$. We show, that the
Rashba spin-orbit field texture in such structures can be controlled by an
electric field, allowing to tune it from radial to tangential. Such spin-orbit
engineering should be useful for designing novel spin-charge conversion and
spin-orbit torque schemes, as well as for controlling correlated phases and
superconductivity in van der Waals materials.
