Note that this reference documentation is identical to the help that is displayed in MATLAB when you type “help ft_headmodel_bemcp”.

  FT_HEADMODEL_BEMCP creates a volume conduction model of the head
  using the boundary element method (BEM) for EEG. This function
  takes as input the triangulated surfaces that describe the boundaries
  and returns as output a volume conduction model which can be used
  to compute leadfields.
  The implementation of this function is based on Christophe Phillips'
  MATLAB code, hence the name "bemcp".
  Use as
    headmodel = ft_headmodel_bemcp(mesh, ...)