Solving Slope-Matching Condition in COMSOL Multiphysics

[womfalcs3]

Homework Statement

How do I set a slope-matching condition in COMSOL?

Homework Equations

u1x=u2x.

The Attempt at a Solution

I have used the Dirichlet BC type. I have multiplied and divided by n, the number of equations, on either side of the boundary.

 

[womfalcs3]

Just realized I should add this...

I have to impose a BC on the function itself and its derivative. So I have to use a Dirichlet BC.

If it were just the derivative, I could use a Neumann, but I have to impose both.