We investigate this trend more specifically as shown within Figure . Interface toughness values at the increments of 0.0X -0.0(X+1) were tested for cases that effectively showed no change to each other when comparing the base incremental values. While we move from an interface toughness of 0.010 to 0.020, we are effectively doubling the toughness, and through this doubling, we can undoubtedly predict that fully accurate transition points may not be represented without testing the values in between. Our predictions were proven correct, as we were able to deduce a trend from these sub-incremental values when simulated, which strengthened our findings. When transitioning from 0 • to 2.5 • , a critical fracture toughness value increase of 0.030 was observed, which began a fairly accurate computational result with our Predicted value plot in Figure . As a crack prefers to propagate in a medium closer to the line of symmetry, it would be expected that an angled interface compared with one completely perpendicular to the line of symmetry would be favorable. The nuances of our study do show that we are investigating pre-deflected cracks, which still hold mysteries to their behavior. After the transition to an angled interface, the simulations showed no noticeable signs of increased deflection occurring until 45 • . The deflection cases transitioned from 2 at 0.01 and 0.02 MPa, to 4 at 0.01, 0.02, 0.03, and 0.04 MPa. This occurrence of 2 more deflection cases indicates the possibility of a transition angle, which will be tested in the 37.5 Over the majority of cases, we see a stark visual difference in the 45 • + cases, with the crack being able to propagate through the material increasingly easier, and in a shorter time. While there are increased deflection cases, the crack immediately propagates into the interface region. Compared with the lower deflection cases, which subsequently are the lower angled cases, the crack in the 45 • and 50 • cases results in material failure at an overall quicker rate.