{$publicFilesDir}

I am theming in OJS3 and now I want to change the logo from the footer. I know that I have to edit the footer.tpl from the lib\pkp\templates\frontend\components.

I can use the example from the header.tpl and pick up the logo image:
{$publicFilesDir}/{$displayPageHeaderLogo.uploadName|escape:"url"}
But I don’t want the logo from the magazine, I want the logo from the site, but I don’t know how to call it?

The url from the site logo is in: \public\site.

any idea?