concat layer vs slice layer

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I have 2 channel data(created using caffe-master/matlab/hdf5creation/store2hdf5). i slice it into 2 parallel sub-networks & then put them togther using concat layer.  after the concat layer is the fully connected layer followed by loss layer. is the concat layer needed or it is superflous?

is this the right way to go? pictorially:

                                          conv1-> ReLu->pool
                                        /                                      \
data_layer->slice layer                                          concat_layer-> full_connected_layer->loss layer
                                        \                                      /
                                          conv1-> ReLu->pool