The Simplest Method I found is to create a Box based on the PerpFrame and then extract two faces to get their centroids and then create a Plane from Three Points.
I should mention that the inputs B and C need to flattened on the Final Component
Even if only the x and y vectors were decomposed, if you connect a plane output to a vector input it will input the normal vector. You could also use the cross product of the x and y vectors to find the normal vector.