> For the complete documentation index, see [llms.txt](https://atomic-data-sciences.gitbook.io/home/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://atomic-data-sciences.gitbook.io/home/product-guides/rheed-analysis/examples/ex-situ-proxies.md).

# Ex-situ Proxies

Develop proxies for ex-situ characterization using empirical Structure-Property relationships

Correlate quantified RHEED patterns with ex-situ characterization

<mark style="color:blue;">**Example**</mark><mark style="color:blue;">:</mark> doping concentration from XPS

<figure><img src="https://1203090133-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvmvL98sMHlVnd4WYhwrt%2Fuploads%2FmVwzH036e3doM4IWhtAX%2Fimage.png?alt=media&amp;token=4762a322-fea8-43ae-9e3f-4791de89c998" alt=""><figcaption><p>Intensity maxima position observed to correlates with doping</p></figcaption></figure>

<mark style="color:blue;">**Steps:**</mark>

1. Run automated feature extraction on RHEED patterns (30 seconds)![](https://1203090133-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvmvL98sMHlVnd4WYhwrt%2Fuploads%2Fs5qd3TnPpeBlDmZJTHXy%2Fimage.png?alt=media\&token=9ed77320-7697-4c6a-8e1d-25ad3b8b5b67)
2. Take top 3 features correlated with doping-composition from XPS and fit a linear regression.![](https://1203090133-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvmvL98sMHlVnd4WYhwrt%2Fuploads%2F41U4hccieidGEmK7ylpz%2Fimage.png?alt=media\&token=6c5dd1cd-8a69-47c3-9151-925289738160)
3. Predict ex-situ characteristics (e.g., doping-composition) for subsequent samples![](https://1203090133-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FvmvL98sMHlVnd4WYhwrt%2Fuploads%2FBPK0BPlI4XeEBKnliFKw%2Fimage.png?alt=media\&token=2cb10acd-14f6-427e-aebb-b42dcc58893b)