Creates a 2D interface material attribute
| attrName | string | name of attribute | 
| energy1 | double | critical fracture energy in 1 direction | 
| strength1 | double | tensile threshold strength in 1 direction | 
| disp1 | double | maximum relative displacement in 1 direction | 
| coupling1 | integer | "Coupled", "UncoupledReversible" or "UncoupledOrigin" | 
| energy2 | double | critical fracture energy in 2 direction | 
| strength2 | double | tensile threshold strength in 2 direction | 
| disp2 | double | maximum relative displacement in 2 direction | 
| coupling2 | integer | "Coupled", "UncoupledReversible" or "UncoupledOrigin" | 
| Return value | IFInterfaceMaterial | 
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