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Stack is not symmetric

Created: January 02, 2019 | Updated: March 08, 2024 | Applies to versions: 2.0, 2.1, 3.0, 3.1, 3.2, 4 and 5
Now reading version 2.0. For the latest, read: Stack is not symmetric for version 5

This documentation page references Altium NEXUS/NEXUS Client (part of the deployed NEXUS solution), which has been discontinued. All your PCB design, data management and collaboration needs can now be delivered by Altium Designer and a connected Altium 365 Workspace. Check out the FAQs page for more information.

The Stack is not symmetric dialog

The Stack is not symmetric dialog

Summary

The Stack is not symmetric dialog allows you to achieve symmetry in the layer stack.

Access

The dialog is accessed by enabling the Stack Symmetry option in the Properties panel in Layer Stack Manager mode. 

Options/Controls

  • Layer stack symmetry mismatches - the grid displays all detected conflicts in layer stack symmetry.
  • Mirror top half down - the settings of each of the layers above the central dielectric layer are copied down to the symmetrical partner-layer.
  • Mirror bottom half up - the settings of each of the layers below the central dielectric layer are copied up to the symmetrical partner-layer.
  • Mirror whole stack down - an additional dielectric layer is inserted after the last copper layer, then all of the signal and dielectric layers are replicated and mirrored below this new dielectric layer.
  • Mirror whole stack up - an additional dielectric layer is inserted before the first copper layer, then all of the signal and dielectric layers are replicated and mirrored above this new dielectric layer.