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+## Isotropic Material model to simulate free surfaces ##
+## For more information see paper Maiti+Eisenlohr2018, Scripta Materialia,
+## "Fourier-based spectral method solution to finite strain crystal plasticity with free surfaces"
+
+---
+homogenization:
+  SX:
+    mech: {type: none}
+
+material:
+  - constituents:
+      - fraction: 1.0
+        O: [1.0, 0.0, 0.0, 0.0]
+        phase: Aluminum
+    homogenization: SX
+  - constituents:
+      - fraction: 1.0
+        O: [1.0, 0.0, 0.0, 0.0]
+        phase: Air
+    homogenization: SX
+
+phase:
+  Aluminum:
+    elasticity: {C_11: 110.9e9, C_12: 58.34e9, type: hooke}
+    generic:
+      output: [F, P, Fe, Fp, Lp]
+    lattice: iso
+    plasticity:
+      type: isotropic
+      output: [xi]
+      xi_0: 31e6
+      xi_inf: 63e6
+      dot_gamma_0: 0.001
+      n: 20
+      M: 3
+      h_0: 75e6
+      a: 2.25
+  Air:
+    elasticity: {C_11: 10e9, C_12: 0.0, type: hooke}
+    generic:
+      output: [F, P, Fe, Fp, Lp]
+    lattice: iso
+    plasticity:
+      type: isotropic
+      output: [xi]
+      xi_0: 0.3e6
+      xi_inf: 0.6e6
+      dot_gamma_0: 0.001
+      n: 5
+      M: 3
+      h_0: 1e6
+      a: 2
+      dilatation: true