code: def get_surface_data(self, material_id, inc_structures=False):
          
          req = "/materials/{}/surfaces".format(material_id)
          if inc_structures:
              req += "?include_structures=true"
          return self._make_request(req)
docs: Gets surface data for a material. Useful for Wulff shapes.
  
          Reference for surface data:
  
          Tran, R., Xu, Z., Radhakrishnan, B., Winston, D., Sun, W., Persson, K.
          A., & Ong, S. P. (2016). Data Descripter: Surface energies of elemental
          crystals. Scientific Data, 3(160080), 1–13.
          http://dx.doi.org/10.1038/sdata.2016.80
  
          Args:
              material_id (str): Materials Project material_id, e.g. 'mp-123'.
              inc_structures (bool): Include final surface slab structures.
                  These are unnecessary for Wulff shape construction.
          Returns:
              Surface data for material. Energies are given in SI units (J/m^2).