<?xml version="1.0" encoding="UTF-8"?>
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd"
      label="Email Order Items List" design_abstraction="custom">
   <body>
       <referenceBlock name="order_totals">
            <block class="Slimcd\Payment\Block\Sales\Totals\Fee" as="surcharge" name="surcharge"/>          
       </referenceBlock>
   </body>
</page>