Create sharepoint People Picker field through powershell script

Visit my previous post for to create a list through powershell script
Create list using powershell script

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$lncustomListName listName
$docSite = new-object Microsoft.SharePoint.SPSite($siteURL)
$docWeb = $docSite.OpenWeb()

/* To create people picker field for allow only one user/group */
Add-SPUserField -listName $lncustomListName -DisplayName MyList -Name MyList -Required TRUE

/* Method to create people picker field
function Add-SPUserField([string]$listName, [string]$DisplayName, [string]$Name, [string]$Required)
{
   $OpenList = $docWeb.Lists[$listName]
   $fldXml = "<Field Type='User' DisplayName='"+ $DisplayName +"' Required='"+ $Required +"' Name='"+ $Name +"'/>"
   $OpenList.Fields.AddFieldAsXml($fldXml,$true,
   [Microsoft.SharePoint.SPAddFieldOptions]::AddFieldToDefaultView)   
}
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Please let me know if faced any issues.