Set-up 1 layout that has 2 barcodes on it. On for the top (1,2) and one for the bottom (3,4).
Right-click on the top barcode select "Edit Expression..." .
There you can define the expression the way you want it.
IF(MOD(RECORD_NR(),2) = 1, [Dino Andereggen], "")
That will show the barcode only when it is a odd record number.
See the helps (F1) for more infos on the commands available.