UnityCACAO-HDRP17/com.unity.render-pipelines.high-definition/Documentation~/snippets/shader-properties/surface-options/recompute-stack-and-iridescence.md

Recompute Stack And Iridescence Indicates whether the StackLit shader simulates its coat/layer effect for each Light individually, rather than once for all Lights at the same time. Note this only applies to punctual, directional, and spot Lights. Enabling this option increases the resource intensity of the shader, so only use it when necessary (for example, when Honor Per Light Max Smoothness is enabled).