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

  FT_APPENDSENS concatenates multiple sensor definitions that have been processed
  separately.
 
  Use as
    combined = ft_appendsens(cfg, sens1, sens2, ...)
 
  A call to FT_APPENDSENS results in the label, pos and ori fields to be
  concatenated, and the tra matrix to be merged. Any duplicates will be removed.
  The labelold and chanposold fields are kept under the condition that they
  are identical across the inputs.
 
  See also FT_ELECTRODEPLACEMENT, FT_ELECTRODEREALIGN, FT_DATAYPE_SENS,
  FT_APPENDDATA, FT_APPENDTIMELOCK, FT_APPENDFREQ, FT_APPENDSOURCE