2×6 Exterior Wall with Rigid Retrofit

Hello, has anyone come across a detail in the GBA library that shows a retrofit for an increased r value on an exterior wall? Similar to a Mooney wall. 1×3 or 2×4 furring running horizontally on the interior side of the exterior wall with rigid insulation, perhaps?
Thanks,
Garrett
GBA Detail Library
A collection of one thousand construction details organized by climate and house part


Replies
Garrett,
https://www.greenbuildingadvisor.com/article/walls-with-interior-rigid-foam
Generally it is not worth it to mix rigid and double stud or Mooney wall. Pick one wall insulation strategy and build it to get the R value you need. Don't complicate your life.