# Define additional ground planes in a multilayer process

Mark auxiliary ground-plane layers with the documented IsGP parameter and check their actual geometry and connections.

## Compatibility

8 beta/preview

Published guidance with release-applicability limits. Confirm package applicability before following this guide.

## Use the layer-level parameter

The LDF manual documents IsGP = True for an auxiliary ground-plane layer. Define it in the relevant layer block when the physical process has multiple ground-plane layers.

IsGP also controls cropping behaviour with CropGP. Labelling a layer as a ground plane is not proof of an electrical connection between separate planes.

## Check boundaries and connectivity

Inspect the generated planes, openings, vias and return-current paths. Review the main GPLayer and the crop/overhang settings where applicable. Keep enough surrounding geometry to avoid a boundary-dominated result and confirm with a controlled comparison.

## Sources and verification details

Recorded inputs/builds only. Complete walkthrough and final-package acceptance remain separate.



- support:SUP-010: Generalised editorial finding; outcome qualification retained
- inductex:docs/manual/ix_ldf.tex: IsGP; CropGP; GPLayer; GPOverHang

- Support history informed this draft. Current-source guidance has been checked; a fresh walkthrough on the intended distributed release and product-owner review remain pending.

## Related guides

- [Adding a process layer breaks a connection or shorts a port](/knowledge-base/inductex-process-connectivity)
- [A port produces a mesh error or appears shorted](/knowledge-base/inductex-terminal-geometry)