How to disable indexing of all pages with a specific get-parameter in robots.txt?

Question

robots.txt

Yandex complained that there are a number of duplicate pages with a get parameter.
A link to such a page looks something like this: site.ru/blog/article?layout=new
The parameter is always the same, but its value changes. How to disable indexing of all links with layout=""?

Answer 1

Disallow: /article?layout=
Allow: /