“…In this subsection we recall a variant of the phase field model (3.5a-d), (3.6a-c) which in the isotropic setting (2.2), (2.4) yields a second order convergence in ε to the sharp interface limit; see e.g. [52,3,45,32,28] for details. In particular, it needs to be assumed that the shape function , recall (3.7), satisfies (3.9a,b).…”