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/usr/share/osgearth/maps/layer_opacity.earth is in osgearth-data 2.4.0+dfsg-6.

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The actual contents of the file can be viewed below.

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<!--
osgEarth Sample : Layer Opacity

This example tests setting a layers initial opacity in the .earth file.

The opacity will only take affect when using a technique that can blend layers together such as the multipass layering technique or the osgEarthUtil::FadeLayerNode

Look for hi-res insets over the cities of Boston and New York.
-->

<map name="hi-res inset" type="geocentric" version="2">

    <options>
        <lighting>false</lighting>
    </options>
     
    <image name="pelican nasa blue marble" driver="tms">
        <url>http://demo.pelicanmapping.com/rmweb/data/bluemarble-tms/tms.xml</url>
    </image>
    
    <image name="boston_inset" driver="gdal" opacity="0.3">
        <url>/usr/share/osgearth/data/boston-inset-wgs84.tif</url>
    </image>
        
</map>