  In this work we theoretically investigate transverse magnetic focussing in
two dimensional electron and hole gasses with strong spin orbit interactions.
We present a general result for spin orbit interaction with singular winding
numbers in the adiabatic limit. We then present results for systems with two
spin orbit interactions of different winding number appear, using the concrete
and experimentally relevant case of an applied in-plane magnetic field in hole
systems with Rashba type interactions. We predict that the application of a
large in-plane field is found to have a strong effect on the magnetic focussing
spectrum.
