Dynamic layer types are more efficient because they allow you to assign a layer type instead of implicitly defining each specific layer name. Dynamic layer types may be substituted anywhere in the matrix file where explicit layer names are used.

Note: All Dynamic Layer Types are enclosed within brackets [].

Here are a listing of the dynamic layer types available throughout the matrix file.
Dynamic Layer Type	Description
[All]	All Layers
[All Metal]	All Metal layers: TOP, BOTTOM, INTERNAL, NEG_PLANE, POS_PLANE
[All Neg_Plane]	All layers with type: NEG_PLANE
[All Pos_Plane]	All layers with type: POS_PLANE
[All Internal]	All layers with type: INTERNAL
[all pcb]	All standard PCB Layer types: Metal, Paste, Silkscreen, Mask
[pcb]	same as [all pcb]
[pcb+nc]	All standard PCB Layer types + NC Layers
[pcb+nc+component]	All standard PCB Layer types + NC Layers + Componens
[visible]	All Visible Layers
[non visible]	All Non-Visible Layers
[Active] or Active	Returns the last layer (created or used).
[Empty]	Returns all empty layers (i.e does not contain objects).
—	—
[Top]	Top Layer
[Bottom]	Bottom Layer
[Top+Bottom]	Top and Bottom layers
[Top_Silk]	Top Side Silkscreen
[Bottom_Silk]	Bottom Side Silkscreen
[Silk]	Top and Bottom Side Silkscreen
[Top_Mask]	Top Side SolderMask
[Bottom_Mask]	Bottom Side SolderMask
[Mask]	Top and Bottom Side SolderMask
[Top_Paste]	Top Side Paste
[Bottom_Paste]	Bottom Side Paste
[Paste]	Top and Bottom Side Paste
[Rout]	Rout/Mill
[Top_Components]	Components Top
[Bottom_Components]	Components Bottom
[Components]	Components Top and Bottom
[Border]	PCB Boarder Layer
[Score]	Score Layer used for Panel Snap-Outs
[Odd Metal]	Odd Metal layer #'s of a stackup. For example: Top, Layer_3, Layer_5, ...
[Even Metal]	Even Metal layer #'s of a stackup. For example: Layer_2, Layer_4, ..., Bottom
[Layer_2]	Metal layer #2 of stackup
[Layer_3]	Metal layer #3 of stackup
[Layer_4]	Metal layer #4 of stackup
...	Continue all internal metal layers of stackup until #31
[Layer_31]	Metal layer #31 of stackup