What is the best rigid insulation to install on the exterior of a stucco wall?

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What kind of insulation do you recommend to put on my exterior sheet rock wall?

Uwe Thomas Published: May 22, 2020, 10 p.m.Last updated: Sept. 27, 2020, 11:42 a.m.

We live in San Jose California. Our house is 50 years old and I would like to add insulation to the outside of our stucco siding (concrete like material, about 3/4" thick). I was thinking about attaching large insulating panels (styrofoam or similar) similar to the ones they use all over Europe. I am looking for a pointer on where to start and find more information. Thanks, 

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