<odoo>
<data>
<record id="extend_view" model="ir.ui.view">
<field name="name">Extend model view</field>
<field name="model">model.name</field>
<field name="inherit_id" ref="base.view.ref"/>
<field name="arch" type="xml">
<xpath expr="//page[last()]" position='after'>
<page string="Extra field">
<group string="Extra group title">
<field name="field_name"/>
</group>
</page>
</xpath>
</field>
</record>
</data>
<odoo>
https://snippets.cacher.io/snippet/6262025fc18cc12fecee
How to make a nice form view for an odoo module.