*INITIAL CONDITIONS, TYPE=STRESS error
 

Hi, I am new to Calculix and GMSH.
I am using GMSH and Calculix to simulate the lattice mismatch stress between Silicon & Silicon Germanium.
The difference in lattices is 4.2%. I am trying to apply this as an initial stress at the interface between the 2 materials.
I am trying to use the Initial Conditions command.

*INITIAL CONDITIONS, TYPE=STRESS
interface,1,4.2%

I get error reading *INITIAL CONDITIONS

Any advice/guidance appreciated regarding the correct manner to do this.

Regards,
Barry.