Stackup construction

I found a four layer stackup with the following arrangement of layers.

[Solder Mask Top]
[Copper Foil Top]
[Copper - Core - Copper]
[Copper Foil Bottom]
[Solder Mask Bottom]

Does it means that PCB house start working with or first pick up [Copper - Core - Copper] then apply [Prepreg] on each copper side and then put [Copper Foil Top] and [Copper Foil Bottom] ?. Finally cure by pressing and heating.

If it is a 4-layer stack-up, we first need a copper foil, then the prepreg, and the copper core, prepreg again and copper foil on the top.


Billy, one of the managers in our facility, is showing you how we stack a 4-layer job.