interphase nanolaminate microstructures multilayers multiscale microrotation microcontinuum microstructure heterostructured proven diffusionless martensitic embrittlement deliverables minima energetics Predictiveness atomistic foundational diffusivity equilibrated compositionally compositional nanometers undeformed interdiffusion nanolaminates interdiffused monatomic atomistics interfacial interatomic Fortran runtimes spacings unrelaxed a nm centroids microrotations centroid evolutions recomendations rhombohedron inhibitive parallelized assumming exhibitted